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i have checked sensers but no joy

heat line c24 no heating hw ok i have noticed that the black motor tends to activate when there is no demaned for hw hence shutting off the flow to heating causing boiler to heat up and shut down ,could it be the pcb? if so how can i check it or can it be repaired?

pillot light cutting out on hot water only ok on heating. I have checked b.p and noticed that the burner pressure will not modulate down when water is hot. I have changed domestic hot water censor and still have the same problem. I have also re-adjusted minimum and maximum burner pressure at the...